The caller identification set by applications using ACL Make Call Request is called Application Populated Caller ID (APCID) and has two parts - number and name.

Call Center customers want to send out (internally and externally) the agent's CLIP (e.g. Service Number) according to the task he is involved in. For example, a Call Center handles calls for different customers (brands) and the agents have to callback to the clients. They want to show the customers (brands) service number.